Stability and reliability of capacitive-type relative humidity sensors using crosslinked polyimide films

A capacitive humidity sensor using cross-linked cellulose acetate butyrate

“…Polymers such as polyimide (PI) [2][3][4][5], polymethyl metacrylate (PMMA) [6][7][8] (PET) [9] and polysulfone (PSF) [5,10,11] are some of the materials employed in capacitive humidity sensors but the material used most of the time in industrial applications is cellulose acetate butyrate (CAB). Indeed, CABs have been known for several years to be suitable polymers for capacitive humidity sensors [6,10,12].…”

Electrical and humidity sensing properties of carbon nanotubes-SiO2-poly(2-acrylamido-2-methylpropane sulfonate) composite material

“…Polyimides [4,5] are the most studied polymer as a capacitive-type sensing material based on the changes in dielectric constant. On the other hand, the most important resistive-type sensing material is poly(2-acrylamido-2-methylpropone sulfonate) (PAMPS) and its salts [6][7][8][9], which have -SO 3 − H + or -SO 3 − M + , where M is an alkali metal.…”

Humidity sensing properties of novel ruthenium polypyridyl complex

“…The petroleum, medical, food industries all manufacture moisture-sensitive products. Furthermore, clean rooms, greenhouses, research and development labs, computer rooms, and nuclear reactors often require fixed moisture levels [1][2][3][4].…”

“…To date many types of humidity sensors have been developed that use a variety of detection methods including: current, resistance, capacitance, conductivity, absorption and luminescence [1][2][3][4][5][6][7].…”